Open interest in prediction markets reached $1.8 billion by the end of June—a 54% increase in a month. The World Cup acted as a catalyst, but CryptoRank data shows a deeper shift: platforms have stopped competing for a single audience and started to specialize.
Kalshi Takes Volume, Polymarket Holds Depth
Weekly trading volume in prediction markets exceeded $3.1 billion in June—and that’s not counting sports markets. Kalshi accounts for $2.6 billion of this, with a platform share over 80%. Polymarket: $492 million.
The gap in volume does not mean Polymarket is leaving. In the structure of open interest excluding sports markets, the ratio between platforms is almost equal—50/50. Kalshi has increased its share by 8.5 percentage points since the start of Q2, but Polymarket retains a significant position balance.
The explanation lies in user behavior. Kalshi attracts high-speed speculative flow: short markets, fast position rotation. Polymarket concentrates capital in long-term bets with a higher average position. These are different audiences with different trading logic.
Crypto Markets Are the Main Front of Competition
Among all verticals, the shift is most noticeable in crypto predictions. According to CryptoRank, Kalshi has captured about 42% of the volume in this segment from Polymarket. The platform with higher position turnover proved closer to the audience accustomed to short-term trading.
Polymarket remains a significant player—it has the advantage of being the first crypto-native platform and has accumulated liquidity. But in terms of attracting new volumes in the crypto vertical, Kalshi is ahead of its competitor.
Politics Is Polymarket’s Domain: 96% of the Market
In political markets, the picture is the opposite. Trading volume in Q2 was $5.7 billion, of which $5.5 billion went through Polymarket—97% of the segment. The platform remains the undisputed leader in politics with no signs of competitive pressure.
The absolute level is below the Q4 2024 peak, when the US presidential election drove political markets to $7.4 billion per quarter. The current volume is 23% below that maximum. At the same time, Polymarket has lost only 11.3% of its previous figure—the platform retains its audience better than the sector as a whole.
World Cup Gave 75% Growth in Daily Volume
FIFA 2026 became the largest sports catalyst in the history of prediction markets. Since the start of the tournament, daily trading volume across the sector has grown by about 75%. In sports markets, volumes are distributed more evenly: Kalshi—$2.8 billion, Polymarket—$1.8 billion.
Sports events change the demographics of participants. The crypto audience comes for fast markets, the political audience for long-term ones. Sports attract a third group: users who otherwise would not have come to the platform. This makes major tournaments not just a volume spike, but a channel for attracting new holders.
Prediction Markets Are No. 1 for Venture Investment in H1 2026
In the first half of 2026, prediction markets became the most funded category in crypto. According to CryptoRank, of the $7.1 billion raised by the top ten categories, prediction markets accounted for $1.85 billion—26% of the total. For comparison: exchanges received $1.57 billion, AI projects—$1.00 billion.
Venture capital rarely misses the timing. When the largest funds direct a quarter of their crypto investments into one category, it’s a signal of a status change. Prediction markets are no longer seen as niche betting tools—investors are reclassifying them as financial infrastructure.
Specialization as a Strategy
The first half of 2026 showed that victory in prediction markets no longer depends on dominating all directions. Kalshi leads in fast volumes and crypto markets. Polymarket controls politics and holds the depth of open interest. Sports markets remain a relatively open territory, where neither platform has established an unambiguous advantage.
The logic of specialization is sustainable as long as each vertical retains its own audience with distinctive behavior. The risk is the emergence of a new player with enough liquidity to cover several segments at once. So far, there is no such contender, and the current split looks structural, not temporary.
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